Apparatus for supplying electric current to vacuum tubes



i 1927. v 3, 69 Apr] F. ZACHER APPARATUS FOR SUPPLYING' ELECTRIC CURRENTTO VACUUM TUBES Filed June' 16, 1925 Patented Apr. 5, 1927. I

I UNITED STATES PATENT OFFICE.

FRANZ zAcHnR, or ERLANGEN, GERMANY, ASSIGNOR 'ro THE FIRM REINIGER, enn-BERT a'soimrr. AKTIENGESELLSCHAFT, or BAVARIA, GERMANY.

APPARATUS FOR SUPPLYING ELECTRIC CURRENT T0 VACUUM TUBES.

Application filed. June 16, 1925, Serial No. 37,579, and in Germany June17,1924.

This invention relates to-improvements in apparatus for supplying vacuumtubes with electric current from an alternating current source.

It is usual to supply vacuum tubes with with a merely rectified E. M. F.

A construct-ion according to the invention is illustrateddiagrammatically 1n the accompanying drawings in which Fig.1 is a dia--grammatic View of a circuit embodying one 7 form of the invention; andFig. 2 is a similar view of another form.

r In these drawings the vacuum tube is indicated as a Rontgen tube a,and the source of alternating current as a transformer 72. The secondaryof the transformer is connected with the Ron'tgen tube, if desired overconsiderable resistances a, through a rotating switch device. In thefigure this switch device is a rotating rectifier e.

If itgis desired to equalize the supply by means of condensers, orgroups of condensers, d as indicated in Figure 2 the rectifier e isconnected on one side only directly to the source of supply, the otherterminal of the source ofsupply being connected with the condensersystem. If it is not desired to use the condensers the connections maybe as in Figure 1.

vminals of the Rontgen tube.

To enable either system of connections to be established at Will achange-over switch 7 is provided. When closed in the full line positionit connects one terminal of the transformer secondary to the condensersor con- Two of the then operates as a rectifier and supplies the tubewith merely rectified current.

What is claimed is:'

In a system for the, operation of vacuum tubes, and particularly Rontgentubes, a

source of alternating current including a secondary winding, a rotaryhigh tension rectifier having certain terminals connected to the polesof said winding, a vacuum tube, two or more condensers in parallel. withthe terminals of said tube and capable-of being connected thereto anddisconnected therefrom, and a switch in the circuit between one of thepoles of said winding and one of the terminals of said rectifier andoperable to alternately disconnect the rectifier-from said pole andconnect the latter'in parallel to the terminals of said tube throughsaid condensers.

In testimony whereof I have alfixed my signature.

FRANZ ZAOHER.

